I currently have it installed on a 2008 iMac and a 2012 MacBook Pro.
I also have ZorinOS On a MacBook Air that works great, and Debian on a MBPro 2014, and am about to install Fedora on another MBPro, 2013. Those are mostly server experiments, though.
Yes, I wind up with a lot of old macs that I am reluctant to recycle!
When you create the live USB installer, you can test it out before installing by booting from the USB stick.
You will probably need to have a way of establishing a wired connection, however, in order to install the Wi-Fi drivers.